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View Full Version : an even TRICKIER deinterlacing scenario...


Fullasoul
6th November 2003, 17:53
Hello,

A couple weeks ago I posted here about a problem I has having where while trying to telecide/decimate my material, I was running into a pattern of 3 progressive frames, 2 interlaced, 3 progressive, then 3 interlaced frames. Donald Graft suggested that I make 2 decimate calls...the first on every 11th frame, then the second on every 10th frame. His suggestion yielded me perfect results, and that project came out terrific...
Now, somehow I've managed to find a far more challenging scenario...one that I'm completely unsure how to handle. Today I'm attempting to deinterlace a source that came from an analog tv capture (NTSC). Once again this material is originated on film (made-for-tv movie to be exact), but the frame pattern it's confronting me with is extremely odd. I get 16 consecutive instances of the old 3 progressive/2 interlaced frames, then suddenly an instance of 2 progressive/2 interlaced! Applying what I learned from Donald last time, I would logically want to start with telecide (obviously), then immediately proceed to decimating every 84th frame. I haven't thought the rest of the procedure through just yet, as obviously the decimate call will not allow me to do this...it's highest allowed cycle setting is 25.
Does anyone have any suggestions on how I could possibly handle this scenario??

Fullasoul

neuron2
6th November 2003, 22:51
Please make an unprocessed source clip available for inspection.

Fullasoul
7th November 2003, 14:38
http://users.quickfox.org/~finallygreen/avisynth/testclip.avi

I don't know how reliable this host is...I literally just signed up so that I had a place to put this for you. This is a 15-second clip of my unprocessed source. I grabbed a little over 400 frames worth so that you could see that the pattern does indeed repeat...unfortunately in DV terms, that makes this approximately 60mb. Hope that's OK...

neuron2
7th November 2003, 15:28
Please check your upload. I get a 3kb file when I download it.

Fullasoul
7th November 2003, 15:55
ugh...yeah I just tried and I got the same thing. I'm trying to find some other place to put a sample, just not having much luck :(

Fullasoul
7th November 2003, 18:29
Ah here we go...got a friend of mine to host the clip for the time being:

http://media.thegameswire.com/fulla/testclip.avi

neuron2
7th November 2003, 23:14
The clip is 3:2 material but with a number of phase changes to the pattern. You can treat it simply like this:

telecide(order=0,guide=1,...)
decimate()